nicolopop

If you used a custom meshes for your race, make a try with the default game meshes and verify all your custom race setting. In CK, Race, Body Data > Skin ! change your race body for the default "SkinNaked" for human or "SkinNakedbeast" for Argonian khajiit...! Also you can create an actor on CK and equip him with your custom race and body for take a look and possibly to see if you have some errors in "Warning box" reported by ck. I saw your mod, you used a special skeleton and racecompatibility with scripts, do you have change this skeleton and racecompatibility mods for SSE version ?

This is a problem with your custom race mod i think... Verify all of your custom race setting, if you used a custom skin, try with the default body "skinnaked" in bodydata tab > "skin" pulling tab...

Enhanced Character Edit (ECE) just press enter in the body color slider... normally work with all colors sliders.